Bucket brake



F. G. KRAFT ET AL June 5, 1928.

BUCKET BRAKE Filed Jan. 6, 1926 2 Shts-Shset l ATTORNEY June 5, 1928.

' F. G. KRAFT ET AL BUCKET BRAKE Filed Jan. 6, 192a 2 Sheets-Sheet 2NVENTORS Patented June 5, 1928.

, UNITED STATES PATENT OFFICE.

FRED e. KRAFT AND RTHUR, E. GUENTHER, or BUFFALO, New YORK, Assrenoas TODU PONT RAYON COMPXF'Y, INCORPO 'E'ORATION OF DELAWARE.

RATED, OF BUFFALO, NEW YORK, A COR" BUCKET BRAKE.

Application filed January Our invention relates to a novel method ofoperating a rayon spinning machine and to a device which is employed inconnection a with the practice of our method. In the type of machinereferred .to a plurality of boxes or buckets, as they are commonlyknown, ,are mounted upon vertical spindles all of which are normallyrotating. The buckets are driven from the spindles by means of asuitable friction drive which will,

however, permit ready removal of the buckets from thespin'dles, all ofwhich are driven from a common source of power. These bucket-s are ofconsiderable weight and retate at relatively high speed, the purpose ofthe rotation being to wind up the rayon as it comes from the spinningnozzles into the form of a cake and at the same time impart thenecessary twist to the filaments. When the cake is of sufficient size,it is removed from the bucket. The usual method of emptying thesebuckets has been to stop the entire machine, empty the buckets asrapid-- ly as possible by lifting them off the spin-' dles and turningthem up-side-down, and

then as rapidl as possible replace the buckets and three the filamentsagain through the guides, so that the buckets will continue theoperation of twisting and winding the rayon. This method causesa loss oftime in shut-ting down the machine, thereby materially reducing theamount of-rayon that each machine can roduce. i

It is, therefore, the object of our invention to provide a method whichwill enable re moving and emptying individual buckets without thenecessity of shutting down the I entire machine; This method is madepossible by the provision of our novel and im- 4 proved brake bymeans ofwhich the rapidly rotating buckets may be lifted, one at a time,

i'trom the spindles on which they are mounted. I

In the accompanying drawings in which.

we have shown selected embodiments of our invention:

Figure 1 shows a section of our improved brake along the line 11 ofFigure 2, to

get-her with, the bucket and driving mechamsm. a

Figure 2 is a'plan view of our brake; Figure 3 is a detail, shownin'section, of

the braking means,

6,1926. Serial No. 79,615.

Figure 4is a sectional view corresponding to Figure land showing anotherembodiment of our invention.

Figure 5 is a plan view of the embodimentshown in Figure 4. 1 1

In Figure 2 are shown two plates 1 and 2 which preferably are madeof'cast aluminum having downwardly projecting angular corner members 3,4, 5 and 6 cast integral therewith. On the top of the plates 1 and 2 arecast bosses 7 and 8 and bearings 9 and 10. tods 11 are secured in thebosses 7 and 8 and are adapted to slide through the bearings 9 and 10.On the bosses and bearings 7, 8,9 and 10 are upright ears or extensions12, 13, 14 and 15', through which extends rods carrying hand grips 16and 17 by means of which the operator may reciprocate the plate 1' alongthe rods 11. On the rods 11 are placed springs 18 and 19 receivedbetween the bosses"? and 8 and the bearings 9 and 10 and tending toforce the plates 1 and 2 apart. The movement of the plates 1 and 2 islimited by means of stops in the form of pins 20 and 21 disposed at theend of the rods 11. v

On the interior of the angular corner members 3, 4, 5 and 6 aresecuredcam blocks 22 by means. of bolts 23. a The inside surfaces of theseblocks are curved to conform to the shape of the rim 35 of a spinningbucket 24, and the blocks are preferably made of aluminum.

On the under surface of each of the plates 21 and 2 is secured a brakeshoe in the form of a fiber sheet 25 which is held in place by rivets26. These fiber sheets cover the entire under surface of the plates 1and 2 that come in contact with the rim of the bucket 24. I

A bracket 27 is secured to the plate 2 by means of bolts 28 and 29, andis provided with a boss 30 in which a rod 31 is fitted. This rod 31 isprovided with a handle 32.

The operation of the device'is asxfollows: The 0 erator seizes thehandle32 inhis left ham and the hand grip rods 16 and 17 with his righthand. The springs 18 and 19 tend to keep the lates 1 and 2 in anextendedposition and the corners 3, .4, '5 and 6 apart so that the device can heslipped down over the rim 35 of the bucket 2 4. The 1 operator lowersthe device over the rapidly rotatiiw bucket and, when the lower rim ofthe blocks 22 is below the rim 35 of the bucket, he presses the grips 16and 17 to gether which causes the plates 1 and 2 to move together alongthe rods 11 and causes the blocks 22 to press a ainst the rim 35 of incethe blocks 22 the rotating bucket.

are curved to conform to the contour of the rim of the bucket, they actas cams and, on coming in contact with the rim of the bucket, they tendto lift the bucket so that the top surface of the bucket comes intoengagement with the fiber sheets 25. The pressure of the blocks 22against the edge of the bucket and the fiber sheets 25 against the topof the bucket, due to the pressure exerted by the hand of the operatorupon the grips 16 and 17, causes the bucket to cease rotating and at thesame time tends to lift it'oif the driving plate 33 and the spindle 34.The handle 3:2 assists the operator in lifting the bucket 24 and at thesame time prevents the device from being twisted from his hands by theforce of the rapidly rotating bucket.

In Figures 4 and 5 we have illustrated another modification of ourinvention in which we employ a spring to exert the gripping and brakingaction on the bucket. This embodimentcomprises two gripping members 36and 37 pivotally 'oined together at 38. The members 36 and 37 areprovided with handles 39 and 40 respectively, where: by a pivotalmovement therebetween may be caused. The members 36 and 37 are arcuateshaped at their lower ed es to conform with the rim 43 of the hue et 41.These lower edges are lined with shoes 42, preferably of aluminum, tocontact with the rim of the bucket.

It will be noticed that the portions of the members 36 and 37 beneaththe rim of the bucket are inclined inwardly so as to form cam surfaces,whereby when the members 36 and 37 come into contact-with the rim of abucket, the rim will be forced upwardly along these inclinedcam surfacesand into tight engagement with the frictional bucket lining. The members36 and 37 are'normally urged toward one another by means ing of a spring45 anchored to the member 37 at 46 and adjacent its other end bearingagainst an adjusting member in the form of a screw 47 threaded into aboss 48 on the member 36. This screw 47 ma be conveniently held inadjusted position by means of the set screw 49. One of the members 36and 37 is provided with a rod 50 terminat in a handle 51andcorresponding to the rod 31 and handle 32 in function.

The operation of this embodiment will now begiven: I

The operator grips the handles 39 and 40 in hisright hand while holdingthe handle 51in his left hand,;pressing the handles 39- and 40 togetherso as to stretch the members 36 and 37 apart, and thus permitting thebrake to be inserted in position on a bucket, this action taking placeagainst a spring 45. Since the lower edges of the members I -Thisresults not only in braking the movement of the bucket, but also inlifting it from the driving means such as the plate 33 illustrated inFigure 1.

It will be noticed that in this embodiment the action is opposite tothat in the preferred embodinient in that the action of the spring isemployed to bring the brake into engagement with the bucket, whereas inthe preferred form the spring is employed to're lease the brake. In thepreferred form the force applied to the brake may be varied by theoperator when removing any particular bucket, the force being varied asis found necessary to offset the. centrifugal force of the bucket,whereas in the form shown in Figures 4 and 5 the force exerted on abucket is constant for all buckets.

In both embodiments weprefer to make the part which comes in contactwith the rotating bucket of some material which will rapidly conductaway the heat which is generated between the bucket and the brake. Forthis purpose we have found that aluminum is very efficient, because ofits high coefficient of heat conductivity. At the same time the wear onthese parts is greatl decreased by employing a metal such as al uminumrather than the usual brake lining material.

From the above it will be apparentthat we have devised a method and adevice for use in practicing that method which will permit the readyremoval of a bucket from the spindle without makin itnecessary to shutdown the entire machine. One bucket is removed by itself and the rayonem tied therefromafter which the bucket is replaced on the spindle andthe operation is repeated will be obvious that only one spindle is out Hof operation at one time; the loss of production when ourinvention isemployed is only approximately one-fiftieth of the time formerlyrequired. l i

It will be obvious to those skilled in the therefore consider that weare entitled to all such changes as fall within the scope of theappended claims. I

We claim:

1. A bucket brake comprising a plurality of relatively movable-members,a hand grip associated with said members adapted to effeet relativemovement of the members by the pressure of the hand, a spring opposingsaid hand pressure, andbraking means adapted to engage a bucket toprevent rotation.

2. A bucket brake comprising a plurality of relatively movable members,hand-operated means adapted to move one of themembers in one directionby the pressure of the hand, a spring adapted to move said member in theopposite direction, and braking means adapted to engage the bucket uponthe contraction of the movable members.

3. A bucket brake comprising two relatively movable members, bucketgripping means secured to each member, a braking surface on each member,hand-operated means for moving one of the movable members in onedirection and a spring adapted to move said movable member in theopposite direction.

4. A, bucket brake comprising two relatively movable members, bucketgripping means secured to each member, a braking surface on each member,hand-operated means for moving one of the movable members in. onedirection and a spring adapted .to move said movable member in theopposite direction, and cam surfaces on the gripping means adapted toforce the bucket into contact with. the braking surface...

5. A, bucket brakecomprising a number of relatively movable members,bucket gripping means secured to each member, a braking surface securedto each member,a spring adapted to hold the members apart, and a handgrip associated with each member whereby t'he'members may be movedtogether against the action of the spring.

6:" A bucket brake comprising two reciprocatingmembers, a hand gripassociated with each member adapted to move the members together by thepressure of ,the hand, a spring'opposing said hand pressure, bucketgrippmg means on each member, braking means on each member, and a camsurfaceon each gripping means to force the bucket into ing surfaceadapted to be brought into brakcontraction of the movable members.

7. A bucket brake comprising a plurality fof of bucket gripping means, abraking surface,/ a. spring tending to held the bucket gripping meansapart, a hand-operateds means for moving the bucket gripping means'intoconeating members, a hand grip associated with each member adapted tomove the members by pressure of the hand, a spring opposing said handpressure, braking means on the movable members, cam surfaces on thegripping means whereby the bucket is lifted and forced into engagementwith the braking means upon the eontraction'of the movable members, anda handle to hold the brake against rotation during the brakingoperation.

9. A bucket brake comprising two reciprocating plates, a plurality ofgripping means secured to each plate, a plurality of rods secured to oneplate on which the other plates are adapted to slide, springs holdingsaid plates apart, a hand grip .on each plate whereby the plates may bemoved toward each other by the pressure of the hand, cam surfaces oneach gripping means, a braking surface on each movable member, and ahandie for holding the brake against rotation during the brakingoperation.

10. A bucket brake comprisin a lurality of relatively movable members,bucket gripping means secured to each member, a brak ing surface securedto each member, a hand grip n e h. member,a spring adapted to move themovable members in one direction,

cam surfaces on the gripping means, and a handle adaptedto steady thebrake against rotation during the braking operation.

All. A bucket brake comprising a plurality of bficket braking surfaces,a plurality of bucket gripping means associated with said surfaces, andcam faces' associated with said ing the braking surfaces into brakingoperation.

13. A bucket brake comprising a plurality,

of bucket gripping means, hand-operated means adapted to'move the bucketgripping er, said movement bringing said cam faces into contact with thebucket and fore-' means into bucket gripping position, a spring tendingto move the bucket gripping means out of bucket gripping position, and abrak- K contact with the braking means upon the hog position by themovement of the hand.

14. A bucket brake comprising a plurality bucket gr pping means,hand-operated means adapted to move the bucket gripping means intobucket gripping position, a-

spring tendin to move the bucket gripping means out. o bucketgripping'position, a,

braking surface adapted to be brought into braking position by themovement of the hand, and a handleadapted to hold the brake againstrotation during the braking operation.

15. A bucket brake comprising two relatively movable plates, tworodssecured to one of said plates on which the other of said tively movableplates, two rods secured to one of said plates on which the other ofsaid plates is adapted to slide, springs on saidrod for holding saidplates apart, bucket gripping means on each plate, said bucket grippingmeans adapted to engage the rim of the bucket, braking surfaces on eachof said plates, a handle on each plate whereby the plates may be drawntogether along said rods by the manipulation of the hand, and a secondhandle on one of the plates whereby the brake is held against rotationduring the brakin operation.

17. n a bucket brake, means permitting said brake to be placed on abucket rotated by a driving means, and means for applying said brake tosaid bucket to stop its rotation and Without stopping the driving means.

18. In a bucket brake,-means permitting said brake to be placed on abucket rotated by a driving means, means for applying said brake to saidbucket 'to stop its rotation and withoutstopping the driving means, andmeans operated by the ap lication of said. brake to disengage saidbucket from its driving means.

In testimony whereof, we have aflixed our signatures to'thisspecification.

FRED G. KRAFT. ARTHUR E. GUENTHER.

